Tvrtko I was a medieval ruler who became the first King of Bosnia in the 14th century. He was born around 1338 and belonged to the Kotromanić dynasty. Tvrtko I expanded his kingdom significantly, incorporating parts of Croatia and Serbia during his reign, which lasted from 1353 until his death in 1391. Under Tvrtko I's leadership, Bosnia experienced economic growth and cultural development. He established strong ties with neighboring regions and was known for his efforts to strengthen the Bosnian state. His reign marked a significant period in the history of Bosnia and Herzegovina.